package com.wzh.yebServe.config;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;

import java.io.IOException;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

/**
 * @Author wzh
 * @create 2022/11/22 22:05
 * @Description: 自定义Authority解析器
 */

public class CustomAuthorityDeserializer extends JsonDeserializer {

    @Override
    public Object deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
        ObjectMapper codec = (ObjectMapper)jsonParser.getCodec();
       JsonNode jsonNode = codec.readTree(jsonParser);
        List<GrantedAuthority> grantedAuthorities=new LinkedList<>();
        Iterator<JsonNode> elements = jsonNode.elements();
        while (elements.hasNext()){
            JsonNode next=elements.next();
            JsonNode authority = next.get("authority");
            grantedAuthorities.add(new SimpleGrantedAuthority(authority.asText()));
        }
        return grantedAuthorities;
    }
}
